Black trisazo dye.



UNITED STATES reruns: OFFICE.

MYRTIL KAHN AND ANTON; OSSENBECK, 0E ELBERFELD, GERMANY, ASSIGNQ'BS TO FARBENEABRIKEN VOZRM. FRIEDI}. B1}

CORPORATION OF GERMANY.

No Drawing.

BLACK TREISAZO DYE.

Specification 0! Letters latent. Application filed Kay 12. 1911. Serial No. 626,801.

To all whom, it ma/g concern:

Be it known that we, MYu'rIL KAI-IN and ANTON Osonnnnon, doctors of philosophy,'

(X meaning a benzene derivative).

The process for their production consists in combining the .tetrazo compound obtained from para -amino benzene -.a-zo 2 amino-8- napht-hoLti-sulfonic acid or from pnra-aminobenzene azo 2-amino 5-naphthol-7-sulfonic acid with one molecule of IB-naphthylenediumin-sulfonic "acid and with one molecule of an aminor a phenol; such as metediam'in, phone], or aminophenol, or derive.- tivos thereof.

The new coloring matters ere after-being dried and}. pulverized in the shape of their alkaline salts dark powders which aresoluble in water generally with whine-black coloration and which are soluhlehi'n concentrated 'loration; yieldupon. treatment wit tunnous chlorid and hj'rdrochlorie acid 'ro-phenylenediamin; n'dinminonn hthol s'u'l-fonic acid, 1.7.8- triuminonaphthal nei-sulfonic acid and an amin. They are suitable for dyeing cotton; The shades thus obtained. can be developed with diazotized para-nitranilin, deep blueblack to black shades of good fastnessbei'n obtained.

In order to illustrate the new process more fully the following example is given, the

parts being by weight: 15 parts of acetylpnrmphenylenediamin are dinzotized and combined with an aqueous solution of 2% partsof 2-0mino-8-naphthol-6-sulfonio acid containing an excess of sodium carbonate.

The mononzo dye is saponified with NaOH acidulnted and converted into the. tetrazo compound. A freshly prepared paste of 24 parts .of 1.Smuphthylenediemin- Lsulfonic acid is added and the acid is slowly neutralized. Subsequently a solution of 12.2 ports 1 of toluylenediamin YER & 90., 01 nnnn'nmw, examiner, n

Patented Au 15, 1911;

is added. The mixture is rendered alkaline with sodium carbonate end is further stirred for 6 hours. The dye is filtered off and dried. It is after being dried and pulverized a dark powder having mostproha'bly the formula.

V113: NH:

nous chlorid and hydrochloric acid paraphenylene-diamin, 2-.7- iaminwS-nephthol- 6sulfonic acid, 1.7.8'tr minonaphthalenetsulfonie a cid and triaminotolucne (CH N11 :NH tNH =1 :2 5 :6) It dyes-cotton in blue-black shades which when developed with diazotized era-Intranilin change into it deep black est to light and to washing which can be discharged to a pure White. The toluylenediamin mentioned in the example can be replaced by other' diamins such as meta-:phenylenedi'amin or .35. described.

' their derivatives, b phenols such as resorcin,

aminophenol and t eir derivatives or homo- L lo'gues. The -2-amino-8-naphthol-6ssulfonic acid can bej-re'placed b the 2-amino-5-naph- 5 thol-7-sulfonic'acid. J hetetrazo com ound can also be combined atfirst with a dlamin, phenol,' etc.,,and then with the 1.8-naphthylenediamin-i-sulfonic acid. We-china 1. The herein described neivtrisazo'dye- ,st'ufls of the :to'rrnulaz- I dyestufis are after bein dried and pulverize'd in the shape of t eir alkaline salts dark' powders which are soluble in water generally with a blue-black v coloration and which are soluble in concentrated sulfuric acid with a blue coloration; yielding upon treatement with s'tannous chlorid and h drochloric acid para-- henylenediamin, a

dlaminonaphthol sulfonlc acid, -.-1.7. 8-triam'- inonaphthalene-e-sulfonic acid and an amin, which dyescan be developed on the fiber '"withd'iazbtized peramitranilin giving deep blue-black to black shades of good. fastness tdxwashihg and to light,' substantially as it meaning .a benzene derivative,) which 2. The herein described new tris azo dye stufl of the formula:

' on '3 NH, NH:

| l l l v 1 NH on 80m \N=N v.

which is after'bein dried and pnlverizeda dark powder solube in water wlth a blueblack coloration and soluble in concentrated sulfuric acid with adark blue coloration;

yielding upon reduction with stahnous chlorid and hydrochloricacid cpara-phenylenediamin, 2.7 '-diamino '8 naphthol-fi-sulfonic' acid, 1.7 .S-triaminonaphthaleixe 4 sulfonic acid and trianiinoto1uene,' dyeing" cotton blue-black sha'des which on being developed 

